Do you have a stroller/travel system into which a car seats fits? If so, I'd go with that. Otherwise Britax and Maxi-Cosi are pretty safe bets - tend to fit in most cars in my experience.
Vivianhui: I have Maxi Cosi that I'd like to sell at home. Still good conditons. I used it only 6months--my son is 1 year old now. We are living at Southside. If you like to view it please send me PM. Thanks.